Revert "Changed all newly made cf host presubmit to postsubmits"

This reverts commit f523229050a1504c9e119c7c172b60b3c450bcad.

Reason for revert: All the postsubmit tests from this CL have been passing consistently for a week. Changing them to presubmit.

Change-Id: I1d83b30c16e88d3539f5f8eb67dddb6d11f6366d
Bug: 131720475
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 0201df9..71249ba 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,5 +1,5 @@
 {
-  "postsubmit": [
+  "presubmit": [
     {
       "name": "circqueue_test",
       "host": true